Anger issues which change your perspective on the world

ok, here it goes. My ex and I have been broken up for the past 3 months because he suddenly had these anger issues, we have tried couple therapy and she suggested "time apart" which did not work because he only got angrier. He is so angry, he hates he shape of the world,he hates how people are murdered and raped and each other and how people lie, and betray each other and yes, these things upset most of us but it has changed him. he is so cynical, sarcastic and rude, he says its ok for him to be rude because he has been hurt, My problem is that he wants to get back together but says that because of his anger he does not know if he can be the sweet guy I used to date, he says that he'll need a lot more time to himself and he probably wont be as romantic because his anger inhibits him. I want to know, is this normal? should I be patient or is this a ploy to get me to be with him even though he wont put any effort into it. I mean can anger really make you destroy whats important to you, and before you reply, you should probably know that during our relationship he was sweet, and romantic but before he was a loner, sarcastic but he didnt hate the world and right now i think he holds onto he's anger like a blanket. I don't know if he really wants to get through it because he says that sometimes it protect him.

I prayed about this, i asked God for sign, as pathetic as it sounds but right now i do not know what to do, i dont feel right walking away at a time when he is going through something but at the same time, I dont want to be one of those women who stay longer than they should.

He says he wants to marry me oneday, and that even though he hates the world i'm different and the one person he'll try with but is he trying because he does not call anymore, he says thinking about me is enough, he does not have to call me to prove it, he does not have to do things people say you need to do in a relationship becasue people just make up these rules and he will not do what other people do just because it is expected. when we're together we have fun, like we use to but he loses his temper easier so we dont joke around as much, the only time he jokes is when I am trying to discuss something serious and he finds that it takes too long so he'll make jokes about it, also, he feels that he can say whatever he wants whenever he wants to no matther who gets their feelings hurt, he says in this regard he is the only one being honest and he does not believe in compromising in relationships.

Is this just something he is going through and should i stay and help, or should I go. please help